maybe i missed it..but i didn't see it mentioned
but so many RVs come with slides today, and slides make a huge difference
much more exposed surface to the sun and the outside air
a 30ft NO slide can be comfortable with one mid mount A/c (two is no doubt better)
however having slides open means you need more A/C
i mean No way a 40ft with 3 slides is going too cool on only two A/C's
way too much exposed surface ..sides, thin top, floor open to outside hot air..sun shining all over it..
and a 31ft with a full slide OPEN, also needs more cooling
all the facts and conditions must be laid out,,to have proper knowledge and consideration